This is a widely distributed flavonoid in onions, apples, berries, and tea.
Quercetin's benefits include reducing inflammation, acting as an antihistamine to alleviate allergy symptoms, and potentially protecting against heart disease and certain cancers.
Occurrence:
Quercetin is widely distributed in the plant kingdom.
It is found in many fruits, vegetables, leaves, and grains. Key dietary sources include onions, apples, grapes (and wine), berries, broccoli, citrus fruits, and tea.
Chemical Nature:
Quercetin is a flavonol, a subclass of flavonoids, known for its yellow crystalline pigment.
Its chemical structure consists of a benzo-γ-pyrone ring system, which is responsible for its antioxidant properties.
As a polyphenolic compound, quercetin possesses several hydroxyl groups attached to its rings, making it highly effective at scavenging free radicals.
Medicinal Benefits:
1. Antioxidant Activity:
Quercetin is a powerful antioxidant that helps in protecting the body from free radicals, reducing the risk of oxidative stress and related chronic diseases.
2. Anti-inflammatory Effects:
It has been shown to reduce inflammation by inhibiting the production of inflammatory cytokines and enzymes.
3. Heart Health:
Quercetin may contribute to heart health by improving endothelial function, reducing blood pressure, and preventing the oxidation of low-density lipoprotein (LDL) cholesterol.
4. Antihistamine and Anti-allergic Properties:
It can help in managing allergy symptoms by inhibiting histamine release from mast cells.
5. Potential Anti-cancer Effects:
Research suggests that quercetin may inhibit cancer cell growth and induce apoptosis in various types of cancer cells.